[Wiotte]

It’s virtually impossible to clean flexible duct without it collapsing or puncturing, it’s a scam. Only hard ducted pipe can be cleaned properly, which is a commercial/industrial application.
Here in TV the residential ducting is flexible duct. Regular filter changes are all that’s required.

Up north I installed pre-filters in all my return registers, this kept the return ducting clean. Here every room has a return register, it would be impractical and unnecessary especially considering we move every 5 years or so or until the new house smell goes away [emoji55]


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